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Hi @Kris Holmes,
Unfortunately, the post-install flyout dialog has been made as the default behavior for PWA, and the corresponding flag has already been removed.
To request settings for disabling the flyout dialog, please send feedback in Microsoft Edge at ··· menu --> Help and feedback --> Send feedback. The Dev Team will be able to review your request then. Thank you for your understanding.
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Best Regards,
Shijie Li